Spring|Spring Cloud Feign实现文件上传下载的示例代码 SpringCloudFeign实现文件上传下载

独立使用Feign

上传文件
下载文件

使用Spring Cloud Feign

上传文件
下载文件

总结

Feign框架对于文件上传消息体格式并没有做原生支持，需要集成模块feign-form来实现。

独立使用Feign 添加模块依赖：

io.github.openfeignfeign-core11.1io.github.openfeign.formfeign-form3.8.0commons-iocommons-io2.11.0

上传文件
定义接口：

public interface FileUploadAPI {// 上传文件：参数为单个文件对象@RequestLine("POST /test/upload/single")@Headers("Content-Type: multipart/form-data")String upload(@Param("file") File file); // 上传文件：参数文多个文件对象@RequestLine("POST /test/upload/batch")@Headers("Content-Type: multipart/form-data")String upload(@Param("files") File[] files); // 上传文件：参数文多个文件对象@RequestLine("POST /test/upload/batch")@Headers("Content-Type: multipart/form-data")String upload(@Param("files") List files); // 上传文件：参数为文件字节数组（这种方式在服务端无法获取文件名，不要使用）@RequestLine("POST /test/upload/single")@Headers("Content-Type: multipart/form-data")String upload(@Param("file") byte[] bytes); // 上传文件：参数为FormData对象@RequestLine("POST /test/upload/single")@Headers("Content-Type: multipart/form-data")String upload(@Param("file") FormData photo); // 上传文件：参数为POJO对象@RequestLine("POST /test/upload/single")@Headers("Content-Type: multipart/form-data")String upload(@Param("file") MyFile myFile); class MyFile {@FormProperty("is_public")Boolean isPublic; File file; public Boolean getPublic() {return isPublic; }public void setPublic(Boolean aPublic) {isPublic = aPublic; }public File getFile() {return file; }public void setFile(File file) {this.file = file; }}}

调用接口：

FileAPI fileAPI = Feign.builder().encoder(new FormEncoder()) // 必须明确设置请求参数编码器.logger(new Slf4jLogger()).logLevel(Logger.Level.FULL).target(FileAPI.class, "http://localhost:8080"); File file1 = new File("C:\\Users\\xxx\\Downloads\\test1.jpg"); File file2 = new File("C:\\Users\\xxx\\Downloads\\test2.jpg"); // 上传文件1：参数为文件对象fileAPI.upload(file1); // 上传文件2：参数为字节数组（注意：在服务端无法获取到文件名）byte[] bytes = FileUtils.readFileToByteArray(file1); fileAPI.upload(bytes); // 上传文件3：参数为FormData对象byte[] bytes = FileUtils.readFileToByteArray(file1); FormData formData = https://www.it610.com/article/new FormData("image/jpg", "test1.jpg", bytes); String result = fileAPI.upload(formData); // 上传文件4：参数为POJO对象FileAPI.MyFile myFile = new FileAPI.MyFile(); myFile.setPublic(true); myFile.setFile(file1); fileAPI.upload(myFile); // 上传文件：参数为多个文件fileAPI.upload(new File[]{file1, file2}); fileAPI.upload(Arrays.asList(new File[]{file1, file2}));

下载文件
定义接口：

public interface FileDownloadAPI {// 下载文件@RequestLine("GET /test/download/file")Response download(@QueryMap Map queryMap); }

调用接口：

// 下载文件时返回值为Response对象，不需要设置解码器FileAPI fileAPI = Feign.builder().logger(new Slf4jLogger()).logLevel(Logger.Level.FULL).target(FileAPI.class, "http://localhost:8080"); String fileName = "test.jpg"; Map queryMap = new HashMap<>(); queryMap.put("fileName", fileName); Response response = fileAPI.download(queryMap); if (response.status() == 200) {File downloadFile = new File("D:\\Downloads\\", fileName); FileUtils.copyInputStreamToFile(response.body().asInputStream(), downloadFile); }

使用Spring Cloud Feign 在Spring框架中使用Feign实现文件上传时需要依赖feign-form和feign-form-spring，这2个模块已经在“Spring Cloud Feign”中自带了，只需要添加spring-cloud-starter-openfeign依赖即可。

org.springframework.cloudspring-cloud-starter-openfeign3.0.2commons-iocommons-io2.11.0

上传文件
定义接口及配置：

@FeignClient(value = "https://www.it610.com/article/FileAPI", url = "http://localhost:8080", configuration = FileUploadAPI.FileUploadAPIConfiguration.class)public interface FileUploadAPI {/*** 上传单个文件* @param file* @return*/@RequestMapping(value = "https://www.it610.com/test/upload/single", method = RequestMethod.POST, headers = "Content-Type=multipart/form-data")String upload(@RequestPart("file") MultipartFile file); /*** 上传多个文件* @param files* @return*/@RequestMapping(value = "https://www.it610.com/test/upload/batch", method = RequestMethod.POST, headers = "Content-Type=multipart/form-data")String upload(@RequestPart("files") List files); class FileUploadAPIConfiguration {@Autowiredprivate ObjectFactory messageConverters; @Beanpublic Encoder feignEncoder () {return new SpringFormEncoder(new SpringEncoder(messageConverters)); }@Beanpublic Logger feignLogger() {return new Slf4jLogger(); }@Beanpublic Logger.Level feignLoggerLevel() {return Logger.Level.FULL; }}}

调用接口：

// 上传单个文件File file = new File("C:\\Users\\xxx\\Downloads\\test1.jpg"); FileInputStream fis = new FileInputStream(file); MockMultipartFile mockMultipartFile = new MockMultipartFile("file", file.getName(), "image/jpg", fis); this.fileUploadAPI.upload(mockMultipartFile); fis.close(); // 上传多个文件File file1 = new File("C:\\Users\\xxx\\Downloads\\test1.jpg"); File file2 = new File("C:\\Users\\xxx\\Downloads\\test2.jpg"); FileInputStream fis1 = new FileInputStream(file1); FileInputStream fis2 = new FileInputStream(file2); MockMultipartFile f1 = new MockMultipartFile("files", file1.getName(), "image/jpg", fis1); MockMultipartFile f2 = new MockMultipartFile("files", file2.getName(), "image/jpg", fis2); this.fileUploadAPI.upload(Arrays.asList(new MockMultipartFile[]{f1, f2})); fis1.close(); fis2.close();

下载文件
定义接口：

@FeignClient(value = "https://www.it610.com/article/FileDownloadAPI", url = "http://localhost:8080", configuration = FileDownloadAPI.FileDownloadAPIConfiguration.class)public interface FileDownloadAPI {/*** 下载文件* @param fileName 文件名* @return*/@RequestMapping(value = "https://www.it610.com/test/download/file", method = RequestMethod.GET)Response download(@RequestParam("fileName") String fileName); // 下载文件时返回值为Response对象，不需要设置解码器class FileDownloadAPIConfiguration {@Beanpublic Logger feignLogger() {return new Slf4jLogger(); }@Beanpublic Logger.Level feignLoggerLevel() {return Logger.Level.FULL; }}}

调用接口：

String fileName = "test.jpg"; Response response = this.fileDownloadAPI.download(fileName); File destFile = new File("D:\\Downloads\\", fileName); // 使用org.apache.commons.io.FileUtils工具类将输入流中的内容转存到文件FileUtils.copyInputStreamToFile(response.body().asInputStream(), destFile);

总结 1.Feign框架需要集成模块feign-form才能支持文件上传的消息体格式。
2.不论是独立使用Feign，还是使用Spring Cloud Feign，下载文件时的返回值都必须为feign.Response类型。
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